The ground state electron configuration for $C r$ is :

[A r] 3 s^{2} 3 d^{4}

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[A r] 3 s^{2} 3 d^{5}

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[A r] 4 s^{2} 3 d^{5}

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[A r] 4 s^{2} 3 d^{4}

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[A r] 4 s^{1} 3 d^{5}

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Solution

The correct option is E $[A r] 4 s^{1} 3 d^{5}$
$C r (24) \to 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{5} 4 s^{1}$
or $[A r] 4 s^{1} 3 d^{5}$

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[A r] 4 s^{1} 3 d^{5}

[A r] 4 s^{1} 3 d^{5}

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